Myself for instance:
I am an Enlisted Navy Sailor ad have been in for 14 years. To get where I am now, I have had to diversify my billet background by taking tough jobs in different areas of the Navy to show my versatility. It has been [reached since I joined to take full advantage of educational benefits, volunteer opportunities, and leaderships positions. I believe that these things have professionally and personally developed me, leading me into the direction to be ready to handle the stresses of being promoted.
The AF focuses on the same basic areas for promotion. Be fully qualified in your area of expertise, have positive promotion recommendations and evaluations, and display your maturity through leadership and followership.